Why does your heat and air still blow in a 1997 cadillac after car is off?

In a 1997 Cadillac, if the heat and air continue to blow after the car is turned off, it could be due to a malfunctioning blower motor relay or a faulty ignition switch. Some vehicles are designed to allow the climate control system to operate for a short period even after the engine is off, but if it runs indefinitely, that indicates a potential electrical issue. Checking the electrical connections and the relay may help diagnose the problem. If the issue persists, it might be best to consult a mechanic.